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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Mar. 31, 2016
Income Tax Disclosure [Line Items]          
Provision for income taxes $ 1,647 $ 1,442 $ 10,297 $ 7,006  
Effective income tax rates 1.70% 2.10% 5.80% 5.90%  
Lapse of statute of limitations     $ 9,400 $ 8,400  
Unrecognized tax benefits $ 66,600   66,600   $ 69,900
Reduction in non-current income taxes payable (55,573)   (55,573)   (59,734)
Increase in current income taxes payable 7,163   7,163   1,553
Accrued interest and penalties related to uncertain tax positions 3,500   3,500   3,600
Expected decrease in uncertain tax positions 12,100   12,100    
China          
Income Tax Disclosure [Line Items]          
Discrete tax benefit due to preferential income tax rate reduction       $ 2,200  
Non-current income tax payable          
Income Tax Disclosure [Line Items]          
Unrecognized tax benefits 55,600   55,600   59,700
Current income tax payable          
Income Tax Disclosure [Line Items]          
Unrecognized tax benefits 1,500   1,500   $ 100
Scenario, Adjustment          
Income Tax Disclosure [Line Items]          
Reduction in non-current income taxes payable 1,400   1,400    
Increase in current income taxes payable $ 1,400   $ 1,400